Can Dogs Eat Grapes?

Grapes and raisins are among the most dangerous foods for dogs. They cause acute kidney failure, and the toxic dose is completely unpredictable — some dogs are severely affected by just a few grapes, while others appear unaffected by larger amounts. This unpredictability means ALL ingestion must be treated as an emergency.

The toxic compound was recently identified as tartaric acid, but individual sensitivity varies enormously. There is no established safe dose for any dog, regardless of size or breed.

All forms of grapes are dangerous: fresh grapes, raisins, currants, grape juice, wine, and grape-containing foods like trail mix, fruitcake, and grape jelly. Raisins are more concentrated and thus potentially more toxic per piece than fresh grapes.

Symptoms typically appear within 6-24 hours: vomiting (often the first sign), loss of appetite, lethargy, abdominal pain, and diarrhea. Within 24-72 hours, kidney failure develops — decreased urination, excessive thirst, and eventually complete kidney shutdown.

Early treatment is critical. If caught within 2 hours of ingestion, inducing vomiting and administering activated charcoal can prevent absorption. Aggressive IV fluid therapy for 48-72 hours is the standard treatment to protect kidney function.